108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*
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* Copyright (C) 2016 by NXP Semiconductors Inc.
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* Date & Time support for PCF2127 RTC
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*/
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/* #define DEBUG */
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#include <common.h>
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#include <command.h>
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#include <dm.h>
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#include <i2c.h>
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#include <rtc.h>
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#define PCF2127_REG_CTRL1 (0x00)
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#define PCF2127_REG_CTRL2 (0x01)
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#define PCF2127_REG_CTRL3 (0x02)
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#define PCF2127_REG_SC (0x03) /* datetime */
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#define PCF2127_REG_MN (0x04)
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#define PCF2127_REG_HR (0x05)
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#define PCF2127_REG_DM (0x06)
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#define PCF2127_REG_DW (0x07)
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#define PCF2127_REG_MO (0x08)
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#define PCF2127_REG_YR (0x09)
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static int pcf2127_rtc_set(struct udevice *dev, const struct rtc_time *tm)
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{
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uchar buf[8];
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int i = 0;
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/* start register address */
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buf[i++] = PCF2127_REG_SC;
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/* hours, minutes and seconds */
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buf[i++] = bin2bcd(tm->tm_sec);
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buf[i++] = bin2bcd(tm->tm_min);
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buf[i++] = bin2bcd(tm->tm_hour);
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buf[i++] = bin2bcd(tm->tm_mday);
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buf[i++] = tm->tm_wday & 0x07;
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/* month, 1 - 12 */
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buf[i++] = bin2bcd(tm->tm_mon + 1);
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/* year */
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buf[i++] = bin2bcd(tm->tm_year % 100);
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/* write register's data */
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if (dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)) < 0)
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return -1;
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return 0;
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}
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static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm)
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{
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int rel = 0;
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uchar buf[10] = { PCF2127_REG_CTRL1 };
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if (dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, 1) < 0)
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return -1;
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if (dm_i2c_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)) < 0)
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return -1;
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if (buf[PCF2127_REG_CTRL3] & 0x04)
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puts("### Warning: RTC Low Voltage - date/time not reliable\n");
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tm->tm_sec = bcd2bin(buf[PCF2127_REG_SC] & 0x7F);
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tm->tm_min = bcd2bin(buf[PCF2127_REG_MN] & 0x7F);
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tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F);
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tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F);
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tm->tm_mon = bcd2bin(buf[PCF2127_REG_MO] & 0x1F) - 1;
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tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900;
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if (tm->tm_year < 1970)
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tm->tm_year += 100; /* assume we are in 1970...2069 */
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tm->tm_wday = buf[PCF2127_REG_DW] & 0x07;
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tm->tm_yday = 0;
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tm->tm_isdst = 0;
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debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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return rel;
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}
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static int pcf2127_rtc_reset(struct udevice *dev)
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{
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/*Doing nothing here*/
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return 0;
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}
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static const struct rtc_ops pcf2127_rtc_ops = {
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.get = pcf2127_rtc_get,
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.set = pcf2127_rtc_set,
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.reset = pcf2127_rtc_reset,
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};
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static const struct udevice_id pcf2127_rtc_ids[] = {
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{ .compatible = "pcf2127-rtc" },
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{ }
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};
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U_BOOT_DRIVER(rtc_pcf2127) = {
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.name = "rtc-pcf2127",
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.id = UCLASS_RTC,
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.of_match = pcf2127_rtc_ids,
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.ops = &pcf2127_rtc_ops,
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};
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